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<p>The proton conductive electrolytes operating under high temperature (100–200 °C) are highly desired for high temperature proton exchange membrane fuel cells (HTPEMFC), which possess high CO tolerance, easy thermal-water management, and high efficiency. However, conventional proton exchange membranes face the challenge of proton carrier leaking. To conquer such issue, in this work, the nanometer-sized proton transport channels are constructed in ZIF-8 membrane, in which deep eutectic solvents (DES) act as proton carriers to build continuous hydrogen-bonding networks. The microporous structure of ZIF-8 would inhibit DES leaking by size sieving. An excellent proton conductivity is achieved in the DES@ZIF-8 membrane, which is 1.21×10<sup>−2</sup> S cm<sup>−1</sup> at 180 °C. Furthermore, it is discovered that weak electron donors could optimize the proton transport pathway by tuning the structure and HOMO of hydrogen-bonding networks, which would lower the activation energy for proton hopping and enhance rapid proton transport. As a proof of concept, the DES@ZIF-8 membrane is fabricated directly into a H<sub>2</sub>/O<sub>2</sub> HTPEMFC. This work provides not only a kind of efficient proton conducive electrolytes, but also theoretical support for improving proton conductivity by optimizing hydrogen-bonding networks.</p>

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Tuning hydrogen-bonding networks inside ZIF-8 membranes by weak electron donors for enhanced high-temperature proton conductivity

  • 期刊论文

  • 发表日期：

    2025年1月21日

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  • Yi Guo,
  • Junsheng Wei,
  • Jingyi Li,
  • Yulong Ying,
  • Weiqiang Zhou,
  • Yu Liu,
  • Qing Yu,
  • Wei Zhang,
  • Huaneng Su,
  • Yanli Zhao

摘要

The proton conductive electrolytes operating under high temperature (100–200 °C) are highly desired for high temperature proton exchange membrane fuel cells (HTPEMFC), which possess high CO tolerance, easy thermal-water management, and high efficiency. However, conventional proton exchange membranes face the challenge of proton carrier leaking. To conquer such issue, in this work, the nanometer-sized proton transport channels are constructed in ZIF-8 membrane, in which deep eutectic solvents (DES) act as proton carriers to build continuous hydrogen-bonding networks. The microporous structure of ZIF-8 would inhibit DES leaking by size sieving. An excellent proton conductivity is achieved in the DES@ZIF-8 membrane, which is 1.21×10−2 S cm−1 at 180 °C. Furthermore, it is discovered that weak electron donors could optimize the proton transport pathway by tuning the structure and HOMO of hydrogen-bonding networks, which would lower the activation energy for proton hopping and enhance rapid proton transport. As a proof of concept, the DES@ZIF-8 membrane is fabricated directly into a H2/O2 HTPEMFC. This work provides not only a kind of efficient proton conducive electrolytes, but also theoretical support for improving proton conductivity by optimizing hydrogen-bonding networks.